actually, if you look into his thread, he says he used 8 42w CFLs for 3 plants, which, if my math is right, should be 8*2600=20800 lumen. and considering your prescious 400w HPS will need a new bulb in 6 mos. to not dip below this figure, im guessing you spend a lot more on your pot than he does. my question however is, about the
Photosynthetically Active Radiation, or PAR values that CFLs give out. if your suchan advanced grower when it comes to HPS lights, why don't you stop making assinine assumptions about something just cause it is new, and whip out your PAR meter and prove me wrong.